What are Automatic Variables? Enlist some commonly used automatic variables?

Automatic variables in the PowerShell are used to store the state information. It is created and maintained by the PowerShell. These are mainly read-only variables.

Some examples of automatic variables are,

• $$ - it contains the last token received by the session.
• $/ - it contains the execution status of the last executed operation in the PowerShell.
• $^ - it contains the first token in the last line.
• $null – it contains the NULL value.
• $_ – it contains the current object in the pipeline.
• $IsWindows – it contains
• $TRUE if you are running on windows or false.
• $Error – it contains an array of error objects in the order of the most recent error.
• $false – it contains the value FALSE.
• $HOME – it contains the path of the user’s home directory.
• $PID – it contains the process ID.
• $IsLinus – it returns true if you are running on Linux or false.
• $IsMacOS – it returns true if you are running on Mac OS or false.
• $PSItem – it contains the current value in the pipeline.